JP6041434B2 - Seat belt retractor and seat belt device using the same - Google Patents

Description

  The present invention relates to a technical field of a seat belt retractor that is mounted on a vehicle such as an automobile and winds up a webbing that is a seat belt with a spool, and a seat belt device that restrains an occupant by a seat belt drawn from the seat belt retractor.

  Conventionally, a seat belt device attached to a vehicle seat of an automobile or the like is used in an emergency such as a vehicle collision in which a deceleration much larger than the deceleration generated during normal driving is applied to the vehicle (hereinafter simply referred to as an emergency). The occupant is restrained by a seat belt composed of webbing. Generally, such a seat belt device includes a seat belt retractor. A conventional seat belt retractor is operated with a large deceleration in an emergency to prevent the seat belt from being pulled out, and a speed higher than a normal seat belt withdrawing speed for seat belt mounting (ie, a seat belt belt). It is often provided with a webbing sensor that is activated when the seat belt is suddenly pulled out at a pulling acceleration larger than the normal pulling acceleration at the time of wearing.

  By the way, for example, even in a seat belt device attached to a vehicle seat on which no occupant is seated and no seat belt is attached, the vehicle sensor may be activated by vibration or the like while the vehicle is running. However, it is desirable to cancel (disable) the original function of the vehicle sensor that prevents the seat belt from being pulled out in the event of an emergency so that the vehicle sensor does not operate except when the occupant is seated. May be. Therefore, the vehicle sensor exhibits its original function when the occupant is wearing the seat belt, and cancels the original function of the vehicle sensor under a predetermined condition other than the occupant's seat belt. A seat belt retractor has been proposed (see, for example, Patent Document 1).

  The seat belt retractor described in Patent Document 1 has a ring gear and a control lever that rotate integrally with the spool. Since the ring gear does not operate the control lever when the seat belt is pulled out from the seat belt retractor, the control lever allows the vehicle sensor to operate and allows the vehicle sensor to perform its original function. The ring gear that rotates as the spool rotates in the seat belt retracting direction operates the control lever, so that the control lever prevents the vehicle sensor from operating while the spool has wound at least the entire seat belt. Cancel the original function of the vehicle sensor.

  On the other hand, the webbing sensor may be operated other than when the seat belt is suddenly pulled out, and may prevent the seat belt from being pulled out from the seat belt retractor. For example, a so-called end lock may occur in which normal withdrawal of the seat belt becomes difficult due to unexpected operation of the webbing sensor when the entire amount of the drawn seat belt is taken up.

  Therefore, in order to prevent such end lock by the belt withdrawal sensor, the webbing sensor is activated when the seat belt is fully retracted to cancel (disable) the original function of the webbing sensor that prevents the seat belt from being withdrawn. A seat belt retractor has been proposed (see, for example, Patent Document 2).

  The seat belt retractor described in Patent Document 2 operates by an inertia plate that swings when the seat belt is suddenly pulled out, a webbing sensor gear that is rotatably provided and has internal teeth and external teeth, and swings of the inertia plate. A webbing sensor pawl that engages with the inner teeth of the webbing sensor gear, and a gear rotation control pawl that engages with the outer teeth of the webbing sensor gear to prevent the rotation of the webbing sensor gear.

  In the seat belt retractor described in Patent Document 2, the gear rotation control pawl is engaged with the external teeth of the webbing sensor gear to rotate the webbing sensor gear while the seatbelt is pulled out from the seatbelt retractor by a predetermined amount. Make it impossible. As a result, when the webbing sensor pawl is operated by the swing of the inertia plate and engaged with the internal teeth of the webbing sensor gear, the webbing sensor gear does not rotate, so that the original function of the webbing sensor is exhibited. Pulling out the seat belt is prevented. In the state where the spool has wound almost all the seat belt, the gear rotation control pawl is separated from the external teeth of the webbing sensor gear so that the webbing sensor gear can be rotated. Thus, even if the webbing sensor pawl is operated by the swing of the inertia plate and engages with the internal teeth of the webbing sensor gear, the webbing sensor gear rotates and the spool can rotate in the seat belt pull-out direction. Therefore, the original function of the webbing sensor is canceled. Therefore, the seat belt can be pulled out and end lock is prevented. In the seat belt retractor described in Patent Document 2, a vehicle sensor is also provided.

U.S. Pat. No. 7,090,304 B2. Japanese Patent No. 3947064.

  By the way, in the seat belt retractor described in Patent Document 1, the webbing sensor is not provided and the function of the webbing sensor cannot be exhibited, and the function of the webbing sensor cannot be canceled under a predetermined condition. On the other hand, in the seat belt retractor described in Patent Document 2, although the vehicle sensor is provided in addition to the webbing sensor, the function of the vehicle sensor cannot be canceled under a predetermined condition. Therefore, by combining the cancel function of the vehicle sensor described in Patent Document 1 and the cancel function of the webbing sensor described in Patent Document 2, both the function of the vehicle sensor and the function of the webbing sensor are determined under predetermined conditions. It is conceivable to cancel at However, if the cancel function of the vehicle sensor described in Patent Document 1 and the cancel function of the webbing sensor described in Patent Document 2 are simply combined, the structure of each sensor and the cancel structure of the function of each sensor become complicated. The number of parts will increase.

  The present invention has been made in view of such circumstances, and an object thereof is to cancel both the function of the vehicle sensor and the function of the webbing sensor under a predetermined condition with a simple structure and a smaller number of parts. And a seat belt device using the same.

In order to solve the above-described problems, a seat belt retractor according to the present invention is a seat belt retractor that includes at least a spool that winds up a seat belt that restrains an occupant, and has a deceleration greater than a deceleration that is normally applied to a vehicle. And a vehicle sensor that functions to prevent rotation of the spool in the direction in which the seat belt is withdrawn, and when the seat belt is suddenly withdrawn at a speed higher than the normal withdrawal speed. A webbing sensor having a function of preventing rotation of the spool in the seat belt withdrawing direction, a function of the vehicle sensor and a vehicle sensor function / webbing sensor function canceling control mechanism for controlling cancellation of the function of the webbing sensor, Vehicle sensor function / Webbin Cancellation cancellation preventing portion sensor function cancel control mechanism to prevent the cancellation of the function of the vehicle sensor according to prior Symbol vehicle sensor function and webbing-sensor-function cancel control mechanism in a state where the are canceled the function of the vehicle sensor is released possess the door, the vehicle sensor function and webbing-sensor-function cancel control mechanism includes a vehicle sensor function and webbing-sensor-function cancel control member for controlling the cancellation of the function of the function and the webbing sensor of the vehicle sensor, the rotation of the spool A control cam member that controls the operation of the vehicle sensor function / webbing sensor function cancel control member by rotating, and the vehicle sensor function / webbing sensor function cancel control member includes the control cam member. A control lever controlled by a cam member, wherein the control lever is connected to the first lever for canceling the function of the webbing sensor, and is connected to the first lever so as to be relatively movable, and cancels the function of the vehicle sensor. And the cancel release preventing portion applies a load larger than a load applied from the vehicle sensor at a normal time in a state where the second lever cancels the function of the vehicle sensor. When applied to the webbing sensor function cancellation control mechanism, the cancellation cancellation preventing unit prevents the cancellation of the function of the vehicle sensor by the vehicle sensor function / webbing sensor function cancellation control mechanism due to this large load. It is characterized by.

Further, the seat belt retractor according to the present invention is such that the cancel release preventing portion is in a state where the first lever of the vehicle sensor function / webbing sensor function cancel control mechanism cancels the function of the webbing sensor. When the large load is applied to the vehicle sensor function / webbing sensor function cancellation control mechanism, the cancellation of the function of the webbing sensor by the vehicle sensor function / webbing sensor function cancellation control mechanism is canceled by this large load. It is also characterized in that it is a cancellation cancellation prevention unit that also prevents

Further, in the seat belt retractor according to the present invention, the control cam member has the cancel cancellation preventing portion, and the cancel cancellation preventing portion of the control cam member cancels the function of the webbing sensor. Canceling the function of the webbing sensor and holding the second lever while the second lever cancels the function of the vehicle sensor. It is a cancellation cancellation prevention unit that prevents cancellation of cancellation of the function of the vehicle sensor .

In the seat belt retractor according to the present invention, the vehicle sensor function / webbing sensor function cancellation control mechanism has a function of the vehicle sensor and a function of the webbing sensor when the spool has wound at least the seat belt. The vehicle sensor and the webbing sensor are controlled so as to be canceled .

  Furthermore, a seat belt device according to the present invention includes a seat belt that restrains an occupant, a seat belt retractor that retracts the seat belt so that the seat belt can be pulled out, and that operates in the emergency to prevent the seat belt from being pulled out, A seatbelt device comprising at least a tongue slidably supported on the seatbelt pulled out from a seatbelt retractor, and a buckle provided on a vehicle body or a vehicle seat and detachably locked on the tongue. Any one of the above-described seat belt retractors of the present invention is used as the seat belt retractor.

With the seat belt retractor according to the present invention configured as described above, both the function of the vehicle sensor and the function of the webbing sensor can be exhibited. In addition, each cancellation of the function of the vehicle sensor and the function of the webbing sensor is controlled by one vehicle sensor function / webbing sensor function cancellation control mechanism. In this case, the vehicle sensor function / webbing sensor function cancellation control mechanism rotates with the rotation of the spool by the vehicle sensor function / webbing sensor function cancellation control member that controls the cancellation of the function of the vehicle sensor and the function of the webbing sensor. A control cam member for controlling the operation of the sensor function / webbing sensor function cancel control member. In addition, the vehicle sensor function / webbing sensor function cancel control member is moved by the control lever, and the control lever is connected to the first lever for canceling the function of the webbing sensor and the first lever so as to be movable relative to the first lever. And a second lever for canceling the function. Accordingly, it is possible to easily control both cancellation of the function of the vehicle sensor and the function of the webbing sensor with a simple configuration using one vehicle sensor function / webbing sensor function cancellation control mechanism.

  In particular, the function of the vehicle sensor and the function of the webbing sensor are canceled when the spool has wound at least the entire seat belt. Then, the function of the vehicle sensor is canceled in this way, so that the vehicle sensor can be disabled. Accordingly, it is possible to prevent abnormal noise from being generated from the vehicle sensor of the seat belt retractor that is not used during traveling of the vehicle. Further, as described above, the function of the webbing sensor is canceled, so that the webbing sensor can be disabled. Thereby, when the seat belt is wound around at least the whole amount of the spool and the spool is stopped, it is possible to prevent the end lock that is generated by the unexpected operation of the webbing sensor.

Even if the vehicle sensor function is cancelled, even if an unintended large load is applied to the vehicle sensor function / webbing sensor function cancel control mechanism for any reason, the vehicle sensor function / webbing sensor function is provided by the cancel release prevention unit. Cancellation of cancellation of the function of the vehicle sensor by the cancel control mechanism can be prevented. Accordingly, the malfunction of the vehicle sensor function / webbing sensor function cancel control mechanism due to the large load can be prevented, and the cancel state of the function of the vehicle sensor can be maintained.
Furthermore, even if the aforementioned large load is applied from the vehicle sensor to the vehicle sensor function / webbing sensor function cancel control mechanism for some reason in the canceled state of the function of the webbing sensor, the vehicle sensor function / webbing sensor function is provided by the cancel release prevention unit. cancellation of the cancellation of the cancellation control mechanism by the webbing sensor function also kill in prevention. Accordingly, the malfunction of the vehicle sensor function / webbing sensor function cancellation control mechanism due to the large load can be prevented, and the canceled state of the function of the webbing sensor can also be maintained.

  In addition, the vehicle sensor function and webbing sensor function cancel control mechanism can use the components used in the conventional seat belt retractor. A webbing sensor function mechanism can be formed, and an increase in the number of parts can be suppressed. As a result, the seat belt retractor can be made compact even if each cancellation of the function of the vehicle sensor and the function of the webbing sensor can be controlled.

  Thus, according to the seat belt retractor according to the present invention, the functions of the vehicle sensor and the webbing sensor are exhibited with a simple structure and a small number of parts, and the functions are canceled under a predetermined condition. It becomes possible.

  On the other hand, according to the seat belt device according to the present invention, it is possible to more effectively prevent the generation of abnormal noise and the occurrence of end lock in the seat belt retractor. The belt mounting operation can be performed smoothly and stably, and the comfort during traveling of the vehicle can be improved.

1 is a perspective view schematically showing a seat belt device including an example of an embodiment of a seat belt retractor according to the present invention. It is a disassembled perspective view of the seatbelt retractor of this example. It is a longitudinal cross-sectional view of the seatbelt retractor of this example. The vehicle sensor function / webbing sensor function canceling control member of the seat belt retractor of this example is shown, (a) is a perspective view of the first lever, (b) is a perspective view of the second lever, (c) an assembly perspective view, d) is a front view, (e) is a bottom view, and (f) is a right side view. It is a figure which shows the state of the cam plate and the 1st and 2nd lever at the time of winding up all the seatbelts of this example. It is a figure which shows the state of the ring gear and the 1st and 2nd lever at the time of winding up all the seat belts of this example. It is a figure which shows the state of the cam plate and the 1st and 2nd lever at the time of pulling out the predetermined amount of the seat belt of this example. It is a figure which shows the state of the ring gear and the 1st and 2nd lever at the time of pulling out the predetermined amount of the seat belt of this example. (A) is a figure explaining the contact state of the latching claw of a 1st lever and the tooth | gear tip part of the ratchet tooth of a ring gear, (b) is the tooth | gear of the ratchet tooth of a 1st lever and a ring gear. It is a figure explaining the engagement state after contact | abutting cancellation | release with a front part.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a view schematically showing a seat belt apparatus including an example of an embodiment of a seat belt retractor according to the present invention.

  As shown in FIG. 1, the seat belt device 1 of this example is basically the same as a conventionally known three-point seat belt device. In the figure, 1 is a seat belt device, 2 is a vehicle seat, 3 is a seat belt retractor disposed in the vicinity of the vehicle seat 2, 4 is retractably wound on the seat belt retractor 3, and a belt anchor 4 a at the tip is A seat belt fixed to the floor of the vehicle body or the vehicle seat 2, 5 is a guide anchor that guides the seat belt 4 pulled out from the seat belt retractor 3 toward the occupant's shoulder, and 6 is guided from this guide anchor 5. A tongue 7, which is slidably supported by the seat belt 4, is a buckle which is fixed to the floor of the vehicle body or the vehicle seat and into which the tongue 6 is detachably inserted. The seatbelt 4 mounting operation and mounting release operation in the seatbelt apparatus 1 are the same as those of a conventionally known seatbelt apparatus.

FIG. 2 is an exploded perspective view of the seat belt retractor of this example, and FIG. 3 is a longitudinal sectional view of the seat belt retractor of this example.
As shown in FIGS. 2 and 3, the seat belt retractor 3 in this example includes a back plate 8a and left and right side walls 8b and 8c each having a circular opening, as in the case of a conventionally known general seat belt retractor. A U-shaped frame 8, a spool 9 that is concentrically or substantially concentric with each opening of both side walls 8 b, 8 c of the frame 8, and is rotatably disposed to wind up the seat belt 4, and the spool 9 is always wound around the seat belt The spring mechanism 10 biased in the take-off direction is fitted and supported concentrically to the rotating shaft 9a of the spool 9. When the rotation is not blocked, it rotates integrally with the rotating shaft 9a, and when the rotation is blocked, the rotating shaft 9a Is a lock gear 11 having a predetermined number of ratchet teeth 11a on the outer periphery thereof, and a flywheel 1 that is an inertia member swingably supported by the lock gear 11 a webbing sensor 12 having an a and an engaging claw 12b provided on the flywheel 12a, an inertia ball 13a which does not operate in a normal state and operates in an emergency, and an actuator 13b and an actuator 13b which operate by the operation of the inertia ball 13a A vehicle sensor 13 (deceleration detection mechanism) having a locking claw 13c that engages with the ratchet teeth 11a of the lock gear 11 and prevents the lock gear 11 from rotating in the seat belt withdrawing direction. The spool 9 is rotatably provided, and when the spool 9 rotates relative to the lock gear 11 in the seat belt pull-out direction, the spool 9 rotates and engages with the inner teeth 8d of the side wall 8c, thereby causing the seat of the spool 9 to rotate. It has a pawl 14 that prevents rotation in the belt drawing direction. In this case, a lock mechanism that locks the rotation of the spool 9 in the seat belt withdrawing direction is configured by the internal teeth 8d of the side wall 8c and the pawl 14, and a lock operation control mechanism that controls the operation of the lock mechanism by the lock gear 11. Is configured. The above-described configuration and operation of the seat belt retractor 3 are the same as the seat belt retractor described in, for example, Japanese Patent Application Laid-Open No. 2009-61810, and can be easily understood with reference to this publication. Description is omitted.

  Further, the seat belt retractor 3 of this example includes a retainer 15, a bearing cap 16, a ring gear 17, an eccentric disk 18, an eccentric gear 19, a cam plate 20, a cover 21, a first lever 22, a second lever 23, and a first lever. An urging spring 24 and a second lever urging spring 25 are provided.

The retainer 15 is detachably attached to the right side wall 8c of the frame 8. The retainer 15 has a cylindrical support protrusion 15a and a predetermined number of internal teeth 15b provided in an annular shape . The bearing cap 16 is fitted to the end of the rotating shaft 9 a of the spool 9 so as to be integrally rotatable, and is rotatably supported by the retainer 15. That is, the rotating shaft 9 a of the spool 9 is rotatably supported by the retainer 15. The ring gear 17 is rotatably supported by the support protrusion 15 a of the retainer 15. The ring gear 17 has a predetermined number of inner teeth 17a provided in an annular shape and has a predetermined number of ratchet teeth 17b which are outer teeth provided in an annular shape on the outer peripheral surface. The annular internal teeth 17a, the engaging claw 12b of the flywheel 12 a is engageable. Then, the locking claw 12b is engaged with the inner teeth 17a of the ring gear 17 that is prevented from rotating, whereby the rotation of the lock gear 11 is prevented.

The eccentric disk 18 is fitted to the end of the bearing cap 16 so as to be integrally rotatable, and is rotatably supported by a support protrusion 21a of a cover 21 that is detachably attached to the retainer 15. Therefore, the eccentric disk 18 can rotate integrally with the spool 9. The eccentric gear 19 is formed in a disc shape and is fitted and supported on the outer peripheral surface 18a of the eccentric disk 18 so as to be relatively rotatable. In that case, when the eccentric disk 18 (that is, the spool 9) rotates, the eccentric gear 19 rotates while moving in the radial direction from the rotation center of the spool 9 (rotates eccentrically). The eccentric gear 19 has outer teeth 19a provided in an annular shape on the outer peripheral surface thereof. In that case, a part of the outer teeth 19 a of the eccentric gear 19 meshes with a part of the inner teeth 15 b of the retainer 15, and the remaining portion of the outer teeth 19 a of the eccentric gear 19 is separated from the remaining portion of the inner teeth 15 b of the retainer 15. When the spool 9 rotates and the eccentric gear 19 rotates eccentrically, the meshing positions of the external teeth 19a of the eccentric gear 19 and the internal teeth 15b of the retainer 15 that are meshed with each other are sequentially changed. The spool 9 is decelerated in the direction opposite to the rotation direction of the spool 9 and rotates. Further, the eccentric gear 19 has an integral rotation pin 19b erected in a direction orthogonal or substantially orthogonal to the plane (that is, the axial direction or the substantially axial direction of the spool 9).

  The cam plate 20 constitutes a control cam member of the present invention, and is rotatably fitted and supported on the inner peripheral surface of the cylindrical support protrusion 21b of the cover 21. The cam plate 20 has an outer peripheral surface on which a cam profile is formed. This cam profile has a first cam portion 20a having a large-diameter arc and a second cam portion 20b having a small-diameter arc formed on the outer peripheral surface. These first and second cam portions 20a and 20b are formed by concentric circular arcs. The cam plate 20 has a rectangular integral rotation hole 20c extending in the radial direction. The integral rotation hole 20c is provided in a region corresponding to the second cam portion 20b in the circumferential direction. The integral rotation pin 19b of the eccentric gear 19 engages with the integral rotation hole 20c in the circumferential direction so as to be slidable along the longitudinal direction of the integral rotation hole 20c (that is, the radial direction of the cam plate 20). So that they cannot be moved relative to each other. As a result, when the eccentric gear 19 rotates, the eccentric gear 19 and the cam plate 20 rotate integrally, and the eccentric gear 19 moves eccentrically relative to the cam plate 20 in the radial direction.

  As shown in FIGS. 2, 3, and 4 (a), the first lever 22 has a cylindrical rotation shaft 22 a, and the rotation shaft 22 a is attached to a support shaft 21 c erected on the cover 21. By being fitted, the support shaft 21c is rotatably supported. The first lever 22 has a cam follower 22b and a locking claw 22c (details are shown in FIG. 9) provided on the back side in FIG. 4A at the other end.

  The cam follower 22b abuts on the first and second cam portions 20a and 20b and moves along the cam surfaces of the first and second cam portions 20a and 20b, thereby controlling the rotation of the first lever 22 ( Note that the second lever 23 is also indirectly controlled by rotation of the first lever 22). When the cam follower 22b is in contact with the first cam portion 20a, the locking claw 22c is separated from the ratchet teeth 17b of the ring gear 17 and does not engage with the ratchet teeth 17b. Thereby, the ring gear 17 can freely rotate. Further, when the cam follower 22b is in contact with the second cam portion 20b, the locking claw 22c engages with the ratchet teeth 17b of the ring gear 17 in a direction in which the rotation of the ring gear 17 in the seat belt pull-out direction is prevented. . As a result, the ring gear 17 cannot be rotated in the seat belt withdrawing direction.

As shown in FIGS. 2 and 4 (b), the second lever 23 includes a pivot shaft hole 23a provided at one end, distribution to the other end portion (an end portion of the pivot shaft hole 23a opposite) And an actuator pressing portion 23b provided. Then, as shown in FIG. 4C, the rotation shaft hole 23 a of the second lever 23 is externally fitted to the rotation shaft 22 a of the first lever 22 so as to be rotatable. In this case, the first lever 22 rotates relative to the second lever 23 by a preset relative angle between a cancel position indicated by a solid line and a cancel release position indicated by a two-dot chain line in FIG. It is possible. At the cancel position of the first lever 22, the first lever 22 is in a direction in which the cam follower 22b is separated from the first and second cam portions 20a and 20b with respect to the second lever 23 (counterclockwise in FIG. 4D). Is relatively unrotatable. Further, at the cancel release position of the first lever 22, the first lever 22 is in the direction in which the cam follower 22b approaches the first and second cam portions 20a and 20b with respect to the second lever 23 (clockwise in FIG. 4D). ) Is relatively unrotatable.

  The first lever biasing spring 24 is disposed between the first lever 22 and the cover 21, and the cam follower 22 b of the first lever 22 contacts the first and second cam portions 20 a and 20 b of the cam plate 20. Always bias in the direction. Further, the second lever biasing spring 25 is disposed between the first lever 22 and the second lever 23, and the first lever 22 with respect to the second lever 23 is indicated by a two-dot chain line in FIG. It is always constantly biased toward the cancel release position shown. At this time, the biasing force of the second lever biasing spring 25 is set smaller than the biasing force of the first lever biasing spring 24. The first and second levers 22 and 23 and the first and second lever urging springs 24 and 25 constitute a vehicle sensor function / webbing sensor function cancellation control member 26 that is a control lever of the present invention. .

  Next, the operation of the seat belt retractor 3 of this example configured as described above will be described. FIG. 5 is a diagram showing an inoperable state of the vehicle sensor by the second lever when the seat belt is fully wound, and FIG. 6 is an inoperable state of the webbing sensor by the first lever when the seat belt is fully wound. FIG.

  As shown in FIG. 5, when the seat belt 4 is not attached, the entire amount of the seat belt 4 is wound around the spool 9 (specifically, the spool 9 is subject to some obstacles due to the urging force of the spring mechanism 10. In a state in which the seat belt 4 is wound up without being wound), the large-diameter first cam portion 20a of the cam plate 20 faces downward, and the cam follower is driven by the biasing force of the first lever biasing spring 24. 22b is in contact with the first cam portion 20a. At this time, the first lever 22 rotates relative to the second lever 23 against the urging force of the second lever urging spring 25 to be in the cancel position.

  As a result, the actuator pressing portion 23b of the second lever 23 comes into contact with the actuator 13b of the vehicle sensor 13 and presses the actuator 13b to the inoperative position, so that the vehicle sensor 13 becomes inoperable. As a result, the inertia ball 13a of the seat belt retractor 3 of the seat belt device 1 that is not used because there is no occupant when the vehicle travels does not swing and no abnormal noise is generated. Further, the locking claw 13 c of the vehicle sensor 13 is held at a non-operating position where it does not engage with the ratchet teeth 11 a of the lock gear 11. Therefore, the function of the vehicle sensor 13 is cancelled.

  Further, when the cam follower 22b is in contact with the first cam portion 20a, the locking claw 22c of the first lever 22 is separated from the ratchet teeth 17b of the ring gear 17, and the ring gear 17 is in the seat belt pull-out direction and the seat belt. It can rotate in any direction of the winding direction. Therefore, the webbing sensor 12 is disabled and the function of the webbing sensor 12 is also canceled. In FIG. 6, the locking claw 12b of the webbing sensor 12 is shown engaged with the internal teeth 17a of the ring gear 17, but the locking claw 12b is separated from the internal teeth 17a. Also good.

  Further, at this time, the eccentric gear 19 moves substantially obliquely upward in FIG. 5 with respect to the cam plate 20 and is eccentric from the center of the cam plate 20 (that is, the center of the spool 9). Accordingly, a part of the outer teeth 19a of the eccentric gear 19 located obliquely upper right is meshed with the inner teeth 15b of the retainer 15, and the eccentric gear including the outer teeth 19a located obliquely lower left is not shown in FIG. The predetermined number 19 of external teeth 19 a are not meshed with the internal teeth 15 b of the retainer 15.

  When the occupant pulls out from the state of the seat belt retractor 3 shown in FIGS. 5 and 6 at a normal pulling speed for wearing the seat belt 4, for example, the spool 9 resists the urging force of the spring mechanism 10 in FIG. The spool 9 rotates clockwise (Note that although the spool 9 is not shown in FIG. 6, the rotation of the spool 9 can be understood normally by rotating the rotating shaft 9a of the spool 9 clockwise in FIG. 6). ). Then, since the eccentric disk 18 rotates integrally with the spool 9 in the same direction, the eccentric gear 19 is decentered and decelerated by the meshing of the outer teeth 19a and the inner teeth 15b, so that the clockwise rotation direction of the spool 9 is reversed. Rotate around. Since the integral rotation pin 19 b of the eccentric gear 19 and the integral rotation hole 20 c of the cam plate 20 are engaged in the circumferential direction, the cam plate 20 rotates in the same direction as the rotation direction of the eccentric gear 19.

  When the cam plate 20 rotates by a relatively small predetermined amount, the cam follower 22b escapes from the first cam portion 20a. Then, the first lever 22 rotates counterclockwise in FIG. 5 by the urging force of the first lever urging spring 24, and the cam follower 22b comes into contact with the second cam portion 20b having a small diameter as shown in FIG. At this time, the first lever 22 rotates relative to the second lever 23 by the biasing force of the second lever biasing spring 25 during the pivoting process of the first lever 22. When the first lever 22 reaches the cancel release position with respect to the second lever 23, the first lever 22 cannot rotate relative to the second lever 23, and the second lever 23 is also integrated with the first lever 22. Rotate in the same direction.

  By the rotation of the second lever 23, the actuator pressing portion 23b is separated from the actuator 13b of the vehicle sensor 13. As a result, the actuator 13b of the vehicle sensor 13 becomes operable, the cancellation of the function of the vehicle sensor 13 is released (off), and the function of the vehicle sensor 13 can be exhibited.

  Therefore, in this state, for example, when the vehicle is running with the seat belt 4 attached to the occupant, the vehicle ball 13 is moved by the inertia ball 13a in an emergency in the same manner as a conventional vehicle sensor, and the locking claw is moved. 13 c engages with the ratchet teeth 11 a of the lock gear 11. Then, the withdrawal of the seat belt 4 is prevented, and the seat belt 4 can restrain the occupant. Further, in the seat belt device 1 provided in the vehicle seat 2 with no occupant, the seat belt 4 is not pulled out, so the seat belt retractor 3 is in an inoperative state shown in FIGS. 5 and 6. Therefore, the function of the vehicle sensor 13 is in a canceled state, and both the inertia ball 13a and the actuator 13b are not allowed to swing. As a result, the noise generated by the swinging of the inertia ball 13a and the actuator 13b while the vehicle is running is prevented.

Further, as the first lever 22 rotates, the locking claw 22c engages with the ratchet teeth 17b of the ring gear 17 as shown in FIG. 8 (enlarged in FIG. 9B). As a result, the rotation of the ring gear 17 in the seat belt withdrawing direction is prevented, the cancellation of the function of the webbing sensor 12 is released (off), and the function of the webbing sensor 12 can be exhibited. Therefore, in this state, when the webbing sensor 12 is likewise seat belt 4 to a conventional known webbing sensor 12 is pulled out in a conventional seat belt withdrawing faster than the speed rapid seat belt withdrawing speed, the flywheel 12 a GaYura The locking claw 12b moves and engages with the internal teeth 17a of the ring gear 17. The ring gear 17 is urged to rotate in the seat belt withdrawing direction by the withdrawal of the seat belt 4, but the rotation of the ring gear 17 in the seat belt withdrawing direction is prevented, so that the seat belt 4 is suddenly withdrawn. Is blocked.

Meanwhile, when the engaging claw 22c by the rotation of the first lever 22 approaches the ratchet teeth 17b of the ring gear 17, the engaging claw 22c as shown in FIG. 9 (a) of the ratchet teeth 17b of the ring gear 17 teeth A case may be considered in which an impact is applied to the locking claw 22c in contact with the tip. In this case, when the latching claw 22c comes into contact with the tip of the ratchet tooth 17b, the first lever 22 is counteracted in FIG. 9A while contracting the second lever biasing spring 25 with respect to the second lever 23. Relatively rotates clockwise. Thereby, the impact when the locking claw 22c contacts the tooth tip portion of the ratchet tooth 17b is absorbed and relaxed. Then, when the ring gear 17 is rotated and the contact between the locking claw 22c and the tooth tip portion of the ratchet tooth 17b is released, the first lever 22 is moved to the second lever 23 as shown in FIG. In contrast, the biasing force of the second lever biasing spring 25 causes relative rotation in the clockwise direction in FIG. Thereby, the latching claw 22c is normally engaged with the ratchet teeth 17b, and the rotation of the ring gear 17 in the seat belt pull-out direction is prevented.

When the seat belt 4 is released from the state in which the seat belt 4 shown in FIGS. 7 and 8 is pulled out by a release of the seat belt 4 or the like, the spool 9 is countered in FIG. The spool 9 rotates in the clockwise direction (the seat belt winding direction) (the spool 9 is not shown in FIG. 8, but in FIG. 8, the rotation shaft 9a of the spool 9 rotates counterclockwise so that the spool 9 Can be understood normally.) As a result, the seat belt 4 is wound around the spool 9. With the rotation of the spool 9, the cam plate 20 is decelerated and rotated counterclockwise in FIG. At this time, the cam follower 22b of the first lever 22 is in contact with the second cam portion 20b of the cam plate 20, and the first and second levers 22 and 23 are held at the positions shown in FIGS.

Immediately before the entire amount of the seat belt 4 is wound, the stepped portion at the boundary between the first cam portion 20a and the second cam portion 20b comes into contact with the cam follower 22b of the first lever 22. When the spool 9 further rotates in the seat belt winding direction, the stepped portion comes into contact with the cam follower 22b. As a result, the spool 9 further rotates in the seat belt winding direction, so that the first and second levers 22 and 23 rotate clockwise in FIG. 7 against the biasing force of the first lever biasing spring 24. To do. As shown in FIGS. 5 and 6, the actuator pressing portion 23b of the second lever 23 abuts against the actuator 13b of the vehicle sensor 13 to hold the actuator 13b in the inoperative position and the second lever 23 is rotated. Stop. However, when the first lever 22 further rotates relative to the second lever 23 while contracting the second lever biasing spring 25 and the first lever 22 enters the cancel position, the rotation of the first lever 22 stops. At the same time, the cam follower 22b comes into contact with the first cam portion 20a . Thereby, the function of the vehicle sensor 13 is canceled.

  Further, when the first lever 22 is rotated, the locking claw 22c of the first lever 22 is separated from the ratchet teeth 17b of the ring gear 17, and the ring gear 17 is in either the seat belt withdrawal direction or the seat belt winding direction. It is also possible to turn in the direction. Therefore, the function of the webbing sensor 12 is canceled.

  When the entire amount of the seat belt 4 is taken up by the spool 9, the rotation of the spool 9 is stopped and the winding of the seat belt 4 by the spool 9 is finished, and the seat belt retractor 3 is in the non-operating state shown in FIGS. Become. At this time, both the function of the webbing sensor 12 and the function of the vehicle sensor 13 are canceled, so that end-locking by the webbing sensor 12 and the vehicle sensor 13 that occurs when the seat belt 4 is fully wound is prevented.

  In this way, in the seat belt retractor 3 of this example, one vehicle sensor function / webbing sensor function cancellation control member 26 is configured by the first and second levers 22 and 23. Further, a vehicle sensor that controls each cancellation of the function of the vehicle sensor 13 and the function of the webbing sensor 12 by the retainer 15, the ring gear 17, the eccentric gear 19, the cam plate 20, and the vehicle sensor function / webbing sensor function cancel control member 26. Function / webbing sensor function mechanism is configured.

  By the way, in the seat belt retractor 3 of this example, in the state where both the functions of the webbing sensor 12 and the vehicle sensor 13 are canceled as described above, an unintended large load is applied from the actuator 13b of the vehicle sensor 13 for some reason. When applied to the portion 23b, this load prevents the vehicle sensor function / webbing sensor function cancel control member 26 from malfunctioning and cancels the cancellation of the function of the vehicle sensor 13. The cancellation of the cancellation of the function of the webbing sensor 12 is also prevented.

The prevention of cancel cancellation will be specifically described. As described above, the rotating shaft 22a of the first lever 22 and the rotating shaft 23a of the second lever 23 are fitted coaxially with each other, but the cam follower 22b of the first lever 22 and the actuator pressing portion 23b of the second lever 23 are The two coaxial rotating shafts 22a and 23a are disposed on the same side. Then, the cam follower 22b of the first lever 22 escapes from the small-diameter second cam portion 20b and comes into contact with the large-diameter first cam portion 20a, so that the first and second levers 22 and 23 rotate in the same direction. . That is, the cam follower 22b of the first lever 22 and the actuator pressing portion 23b of the second lever 23 rotate in the same direction. Then, when the actuator pressing portion 23b comes into contact with the actuator 13b and presses the actuator 13b, the rotation of the second lever 23 stops. As a result, the function of the vehicle sensor 13 is canceled as described above. Even if the rotation of the second lever 23 is stopped, the first lever 22 rotates relative to the second lever 23 while contracting the second lever biasing spring 25, and when the second lever 23 is in the cancel position, the first lever 22 The rotation stops. As a result, the function of the webbing sensor 12 is canceled as described above.

  In the canceled state of the functions of the webbing sensor 12 and the vehicle sensor 13, when an unintended large load is applied to the actuator pressing portion 23b from the actuator 13b of the vehicle sensor 13, the cam follower 22b comes into contact with the first cam portion 20a. In addition, since the first lever 22 cannot rotate relative to the second lever 23 in the clockwise direction in FIG. 5, this load is applied to the first cam portion via the first and second levers 22 and 23. The first and second levers 22 and 23 are supported by 20a and do not rotate in the direction in which the actuator pressing portion 23b is separated from the actuator 13b. Therefore, even if a large unintended load is applied from the vehicle sensor 13 to the vehicle sensor function / webbing sensor function cancel control member 26, the vehicle sensor function / webbing sensor function cancel control member 26 does not malfunction, and the webbing sensor 12 and the vehicle Both cancel states of each function of the sensor 13 are maintained. Thus, the 1st cam part 20a comprises the cancellation cancellation prevention part of this invention.

  According to the seat belt retractor 3 of this example, both the function of the vehicle sensor 13 and the function of the webbing sensor 12 can be exhibited. Further, the cancel of the function of the vehicle sensor 13 and the function of the webbing sensor 12 is controlled by the retainer 15, the ring gear 17, the eccentric gear 19, the cam plate 20, and the vehicle sensor function / webbing sensor function cancel control member 26. Therefore, each cancellation of the function of the vehicle sensor 13 and the function of the webbing sensor 12 can be easily controlled with a simple configuration using one vehicle sensor function / webbing sensor function cancellation control member 26.

  In particular, the function of the vehicle sensor 13 and the function of the webbing sensor 12 are canceled when the spool 9 winds up at least the entire seat belt 4. The vehicle sensor 13 is disabled by canceling the function of the vehicle sensor 13 in this way. This prevents the generation of noise from the vehicle sensor 13 of the seat belt retractor 3 that is not used while the vehicle is running (that is, the seat belt retractor 3 of the seat belt device 1 attached to the vehicle seat 2 that does not have an occupant). be able to. Further, as described above, the function of the webbing sensor 12 is canceled, so that the webbing sensor 12 is substantially disabled. Thereby, when the seat belt 4 is wound up at least by the spool 9 and the spool 9 is stopped, it is possible to prevent an end lock caused by the webbing sensor 12 operating unexpectedly.

  Further, in the canceled state of the function of the vehicle sensor 13, even if an unintended large load is applied to the actuator pressing portion 23b from the actuator 13b of the vehicle sensor 13 for some reason, the first and second levers 22 and 23 are not The portion 23b does not rotate in the direction away from the actuator 13b. Accordingly, the malfunction of the vehicle sensor function / webbing sensor function cancel control member 26 due to this load can be prevented, and the cancel state of the function of the vehicle sensor 13 can be maintained.

  Furthermore, since the retainer 15, the ring gear 17, the eccentric gear 19, and the cam plate 20 can be the same as those used in the conventional seat belt retractor 3, no significant design change is required. A vehicle sensor function / webbing sensor function mechanism can be formed, and an increase in the number of parts can be suppressed. As a result, the seat belt retractor 3 can be formed in a compact manner even if the cancellation of the function of the vehicle sensor 13 and the function of the webbing sensor 12 can be controlled.

  In this way, according to the seat belt retractor 3 of this example, the functions of the vehicle sensor 13 and the webbing sensor 12 can be exhibited with a simple structure and a small number of parts, and these functions can be performed in a predetermined manner. It is possible to cancel under conditions.

  On the other hand, according to the seatbelt device 1 of this example, it is possible to more effectively prevent the generation of noise and the end lock in the seatbelt retractor 3, so that the operability of the seatbelt 4 is improved and the occupant is improved. The seat belt 4 can be mounted smoothly and stably, and the comfort during traveling of the vehicle can be improved.

  In addition, this invention is not limited to the above-mentioned example, A various design change is possible. For example, in the above-described example, the vehicle sensor function / webbing sensor function cancel control member 26 is configured by two first and second levers 22 and 23 connected to each other so as to be relatively rotatable. The webbing sensor function cancellation control member 26 can be configured by only one first lever 22. In this case, the locking claw 22c of the second lever 23 is provided integrally with the first lever 22 as a corresponding locking claw. And when the latching claw provided in the 1st lever 22 contact | abuts the tooth | gear part of the ratchet tooth | gear 17b of the ring gear 17, the impact is absorbed and relieved because the 1st lever urging | biasing spring 24 contracts. . However, the urging force of the first lever urging spring 24 needs to be set larger than the urging force of the second lever urging spring 25 because the cam follower 22b needs to follow the first and second cam portions 20a and 20b. There is. Therefore, in order to more effectively absorb and mitigate the impact described above, the vehicle sensor function / webbing sensor function cancel control member 26 is configured by the two first and second levers 22 and 23 as in the above example. It is preferable.

  In the above-described example, one cam plate 20 for controlling the rotation of the first and second levers 22 and 23 is provided in common. However, the cam plate is provided separately for each of the first and second levers 22 and 23. Two can be provided correspondingly. In short, the present invention can be variously modified within the scope of the matters described in the claims.

  A seat belt retractor and a seat belt device according to the present invention include at least a vehicle sensor that prevents the seat belt from being pulled out in an emergency, and a webbing sensor that prevents the seat belt from being pulled out when the seat belt is suddenly pulled out. It can utilize suitably for the seatbelt apparatus using this.

DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 3 ... Seat belt retractor, 4 ... Seat belt, 6 ... Tongue, 7 ... Buckle, 8 ... Frame, 9 ... Spool, 11 ... Lock gear, 12 ... Webbing sensor, 12a ... Flywheel, 12b ... Locking claw, 13 ... Vehicle sensor, 13a ... Inertial ball, 13b ... Actuator, 13c ... Locking claw, 15 ... Retainer, 15b ... Internal tooth, 17 ... Ring gear, 17a ... Internal tooth, 17b ... Ratchet tooth, 18 ... Eccentric disc, 19 ... Eccentric gear, 19a ... External teeth, 19b ... Integral rotation pin, 20 ... Cam plate, 20a ... First cam part (cancellation prevention part), 20b ... Second cam part, 20c ... Integral rotation hole, 22 ... 1st lever, 22b ... Cam follower, 22c ... Locking claw, 23 ... 2nd lever, 23b ... Actuator pressing part, 24 ... 1st lever Over biasing spring, 25 ... second lever biasing spring 26 ... vehicle-sensor-function and webbing sensor function cancel control member

Claims (5)

In a seat belt retractor having at least a spool for winding up a seat belt that restrains an occupant,
A vehicle sensor having a function of operating in an emergency in which a deceleration larger than a deceleration applied to a vehicle is applied to the vehicle in an emergency, and preventing rotation of the spool in the seat belt withdrawing direction;
A webbing sensor that operates when the seat belt is suddenly pulled out at a speed faster than a normal drawing speed, and has a function of preventing rotation of the spool in the seat belt pull-out direction;
A vehicle sensor function / webbing sensor function cancellation control mechanism for controlling cancellation of the function of the vehicle sensor and the function of the webbing sensor;
That the cancellation of the vehicle sensor function and webbing-sensor-function cancel control mechanism said Vik Le sensor function according to prior Symbol vehicle sensor function and webbing-sensor-function cancel control mechanism in a state where the are canceled function of the vehicle sensor is released A cancellation cancellation prevention unit to prevent,
I have a,
The vehicle sensor function / webbing sensor function cancellation control mechanism includes a vehicle sensor function / webbing sensor function cancellation control member for controlling cancellation of the function of the vehicle sensor and the function of the webbing sensor, and a vehicle by rotating with the rotation of the spool. A control cam member for controlling the operation of the sensor function / webbing sensor function cancel control member ,
The vehicle sensor function / webbing sensor function cancel control member is a control lever that is controlled by the control cam member,
The control lever includes a first lever that cancels the function of the webbing sensor, and a second lever that is coupled to the first lever so as to be relatively movable and cancels the function of the vehicle sensor.
The cancel cancellation prevention unit applies a load larger than the load applied from the vehicle sensor at a normal time to the vehicle sensor function / webbing sensor function cancel control mechanism in a state where the second lever cancels the function of the vehicle sensor. A cancellation cancellation preventing unit that prevents cancellation of the function of the vehicle sensor by the vehicle sensor function / webbing sensor function cancellation control mechanism due to this large load,
A seat belt retractor characterized by that. The cancel cancellation prevention unit is configured to apply the large load from the vehicle sensor to the vehicle sensor function / webbing in a state where the first lever of the vehicle sensor function / webbing sensor function cancel control mechanism cancels the function of the webbing sensor. when added to the sensor function cancel control mechanism, it is canceled cancellation preventing portion for preventing even the cancellation of the vehicle sensor function and webbing said by sensor function cancel control mechanism webbing sensor functions by this large load is released The seat belt retractor according to claim 1, wherein the seat belt retractor is provided. The control cam member has the cancel cancellation prevention unit,
The cancel cancellation preventing portion of the control cam member holds the first lever while the first lever cancels the function of the webbing sensor, or the second lever cancels the function of the vehicle sensor. by holding the second lever in a state that you are, claim 2, wherein said a cancel cancellation preventing portion together to prevent cancellation release of webbing cancel release and function of the vehicle sensor function of the sensor The seat belt retractor described in 1. The vehicle sensor function and the webbing sensor function cancel control mechanism are arranged so that the function of the vehicle sensor and the function of the webbing sensor are canceled when the spool has wound at least the seat belt. The seatbelt retractor according to any one of claims 1 to 3, wherein the sensor is controlled . A seat belt that restrains an occupant, a seat belt retractor that retracts the seat belt so that the seat belt can be withdrawn, and that is actuated in an emergency to prevent the seat belt from being withdrawn, and the seat belt withdrawn from the seat belt retractor In a seatbelt device comprising at least a tongue that is slidably supported and a buckle that is provided on a vehicle body or a vehicle seat and that is detachably locked to the tongue,
The seat belt retractor according to any one of claims 1 to 4, wherein the seat belt retractor uses the seat belt retractor.

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